Method/Apparatus/Procedure: The analytical method was used. After separation both phases were analyzed. Water in the organic-rich phase was analyzed by the Karl Fischer method. The samples were analyzed by glc with propanol as the internal standard. A known amount of decane (about 10% by weight) was added to the water-rich phase and then after separation, samples of upper phase were analyzed by glc (the assumption was made that there was no hexane in lower phase). Vapor pressures over the two-phase mixtures were measured by static method described in Ref. 1.